Question Regarding OS 12 TR Rebuild
I have a question for you guys out there who have rebuilt a OS 12 TR-R spec or have put the R spec Piston/Liner in the standard TR.
Basically, it appears that you can only buy the TR-R spec Piston?Liner now and this is a direct replacement for the original crankcase. Thats all fine and fits together well.
MY QUESTION IS.....
The TR-R spec piston has a cutout of the skirt on one side (or I guess you could call it an indent, should this cutout point towards the exhaust port or towards the carb side of the engine?
OS support told me it should point toward the exhaust side as the skirt indent is there to clear the backplate, but the piston clears the backplate either way you put it in.
One thing I noticed though is with the indented skirt facing the exhaust port, the exhaust port is open UNDER the piston at TDC at the same time that the intake is open in the crankshaft....is this all normal?
Any info would be much appreciated